Best lube for grey tank and black tank valves

In 40 years of RVing I never have lubed my dump valves

Once the RV is parked after a trip and all cleaned up, I put on rubber gloves and give all valves, including the slide valve in the bottom of the toilet, a rub-down with silicone grease. Expensive stuff, but a great rubber preservative.

:)
Lynn

I've used this stuff, but really, can't tell any difference.

When I replace my valves, I coated them with silicone grease

I see one here uses coconut oil. that is what I have used.
bumpy

When I could actually get to the valve, a couple of shots of vegi oil did a great job.

old guy wrote:
veggie oil and any grease for the shaft

I would think that any oil would float on the black water and not do much lubricating. I would think one would need a water soluble oil if such a thing exist. Maybe the oil that is used to cool cutting tools in a machine shop.

MitchF150 wrote:
How would you "lube" them in the first place??

Dump the tanks, close the dump valves, dump in a quart of vegetable oil, open and close the dump valves rapidly a few times to spread it around.

NEVER USE ANY KIND OF PETROLEUM PRODUCT LIKE VASELINE OR 3-IN-1 OIL!

Since I now know it’s an issue...40 years after my first TC...I’ll lube them religiously.